LG SJ7 - Page 52

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ONE POINT REPAIR GUIDE
SECONDARY UNIT
4. NO SOUND (BLUETOOTH)
4-1. Solution
Replace MAIN board.
4-2. How to troubleshoot (Countermeasure)
1) Please check status of Bluetooth cable connection (at CN501 and BT module).
2) Please check 3.3 V (at pin10 of CN501).
If 3.3 V is OK, please check BT_DAT, BT_CLK, BT_RST, UART_RX, UART_TX (pin1, 2, 4, 6, 9).
If no signal, please replace MAIN board.
4-3. Service hint (Any picture / Remark)
< MAIN board top view >
CN501
CN501
CN501
CN501
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BLUETOOTH